N‐(2‐Thiophenesulfonyl)prolinamide could be easily introduced into Montmorillonite by a simple ion‐exchange reaction. The asymmetric aldolreactions between various isatins with acetone or acetaldehyde using a heterogeneous Montmorillonite‐entrapped organocatalyst afforded products with high enantioselectivity. The catalyst was readily reusable without significant loss of catalytic activity or enantioselectivity.
Chiral dicationic Pd-complex-catalyzed enantioselective ene and aldol reactions with various isatin derivatives are shown to produce the corresponding 3-hydroxy-2-oxindole products in good yields with high enantioselectivities. These catalytic processes are effective not only with isatins but also with keto esters and diketones derivatives. Even with unprotected isatin, high yields and enantioselectivities